Circle (A41): Reflection of Triplet circle through O'

Definition

Let T be the point on CD beyond D such that CT = AB. The lines AT and BT meet again (O1) and (O2) in points I1 and I2. The lines I1O1 and I2O2 meet in F. The incircle of O1O2F is the Archimedean circle (A41). It is the reflection of Bankoff's Triplet Circle (A2) through the midpoint O' of AB. [Bui 2007]


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